[Piglit] [PATCH] arb_texture_stencil8: test updating just stencil of a z32f_s8 texture

[Ilia Mirkin]

This extension introduces GL_STENCIL_INDEX as an allowable format for
glTexSubImage, which can trigger a partial update of a depth/stencil
texture.

Exploits an assumption about source row stride in mesa's storage helper
for z32f_s8 stores to trigger failures on (current) mesa.

Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu>
---
 .../arb_texture_stencil8/CMakeLists.gl.txt    |   1 +
 tests/spec/arb_texture_stencil8/texsubimage.c | 116 ++++++++++++++++++
 2 files changed, 117 insertions(+)
 create mode 100644 tests/spec/arb_texture_stencil8/texsubimage.c

diff --git a/tests/spec/arb_texture_stencil8/CMakeLists.gl.txt b/tests/spec/arb_texture_stencil8/CMakeLists.gl.txt
index d8de83c4d..58b9e625d 100644
--- a/tests/spec/arb_texture_stencil8/CMakeLists.gl.txt
+++ b/tests/spec/arb_texture_stencil8/CMakeLists.gl.txt
@@ -12,5 +12,6 @@ piglit_add_executable (arb_texture_stencil8-stencil-texture stencil-texture.c)
 piglit_add_executable (arb_texture_stencil8-draw draw.c)
 piglit_add_executable (arb_texture_stencil8-fbo-stencil8 fbo-stencil8.c)
 piglit_add_executable (arb_texture_stencil8-getteximage getteximage.c)
+piglit_add_executable (arb_texture_stencil8-texsubimage texsubimage.c)
 
 # vim: ft=cmake:
diff --git a/tests/spec/arb_texture_stencil8/texsubimage.c b/tests/spec/arb_texture_stencil8/texsubimage.c
new file mode 100644
index 000000000..922644597
--- /dev/null
+++ b/tests/spec/arb_texture_stencil8/texsubimage.c
@@ -0,0 +1,116 @@
+/*
+ * Copyright (c) 2019 Ilia Mirkin
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+/**
+ * \file texsubimage.c
+ *
+ * Test glTexSubImage with format = GL_STENCIL_INDEX. Based on getteximage.c.
+ */
+
+#include "piglit-util-gl.h"
+
+PIGLIT_GL_TEST_CONFIG_BEGIN
+	config.supports_gl_compat_version = 12;
+	config.window_visual = PIGLIT_GL_VISUAL_RGBA;
+	config.khr_no_error_support = PIGLIT_NO_ERRORS;
+PIGLIT_GL_TEST_CONFIG_END
+
+
+#define WIDTH 17
+#define HEIGHT 17
+
+static bool
+test_z32f_s8(void)
+{
+	uint32_t tex[WIDTH * HEIGHT * 2];
+	uint32_t buf[WIDTH * HEIGHT * 2];
+	uint8_t update[WIDTH * HEIGHT];
+	bool ret = true;
+	int i;
+
+	/* init tex data */
+	for (i = 0; i < WIDTH * HEIGHT; i++) {
+		tex[2 * i] = 0x3f800000;
+		tex[2 * i + 1] = 0x80;
+	}
+
+	/* create texture */
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH32F_STENCIL8,
+		     WIDTH, HEIGHT, 0,
+		     GL_DEPTH_STENCIL, GL_FLOAT_32_UNSIGNED_INT_24_8_REV, tex);
+	if (!piglit_check_gl_error(GL_NO_ERROR))
+		return false;
+
+
+	/* update texture */
+	for (i = 0; i < WIDTH * HEIGHT; i++) {
+		tex[2 * i + 1] = update[i] = i & 0xff;
+	}
+	glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+	glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, WIDTH, HEIGHT,
+			GL_STENCIL_INDEX, GL_UNSIGNED_BYTE, update);
+
+	/* read back the texture */
+	glGetTexImage(GL_TEXTURE_2D, 0,
+		      GL_DEPTH_STENCIL, GL_FLOAT_32_UNSIGNED_INT_24_8_REV, buf);
+	if (!piglit_check_gl_error(GL_NO_ERROR))
+		return false;
+
+	/* compare */
+	for (i = 0; i < WIDTH * HEIGHT; i++) {
+		if (buf[2 * i] != tex[2 * i]) {
+			printf("Wrong depth texel data at position (%d,%d): "
+			       "Expected 0x%08x, found 0x%08x\n",
+			       i % WIDTH, i / WIDTH, tex[2 * i], buf[2 * i]);
+			ret = false;
+		}
+		if (buf[2 * i + 1] != tex[2 * i + 1]) {
+			printf("Wrong stencil texel data at position (%d,%d): "
+			       "Expected 0x%08x, found 0x%08x\n",
+			       i % WIDTH, i / WIDTH, tex[2 * i + 1], buf[2 * i + 1]);
+			ret = false;
+		}
+	}
+
+	return ret;
+}
+
+void
+piglit_init(int argc, char **argv)
+{
+	bool pass;
+
+	piglit_require_extension("GL_ARB_texture_stencil8");
+
+	pass = test_z32f_s8();
+
+	piglit_report_result(pass ? PIGLIT_PASS : PIGLIT_FAIL);
+}
+
+
+enum piglit_result
+piglit_display(void)
+{
+	/* unused */
+	return PIGLIT_FAIL;
+}
-- 
2.21.0